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Table 3 Serum viral neutralization test results using type 1 and type 2 PRRSV

From: Vaccination of sows against type 2 Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) before artificial insemination protects against type 2 PRRSV challenge but does not protect against type 1 PRRSV challenge in late gestation

 

Against type 1 PRRSV

Against type 2 PRRSV

 

Days of gestation

Days of gestation

Group

93

100

107

114

93

100

107

114

1

0/5*

0/5

2/5a

3/5

0/5

2/5

3/5

5/5

0.40 ± 0.79

1.73 ± 0.85

2.29 ± 0.41b

2.21 ± 0.19

0.25 ± 0.50

2.11 ± 0.19

2.26 ± 0.49

2.75 ± 0.50

2

0/5

0/5

0/5

1/5

0/5

3/5

4/5

5/5

0.25 ± 0.50

0.75 ± 0.50

1.29 ± 0.34

2.05 ± 0.07c

0.25 ± 0.50

2.34 ± 0.46*

3.51 ± 0.56*

3.75 ± 0.50*

3

0/5

0/5

2/5

3/5

0/5

1/5

1/5

2/5

-

1.15 ± 0.29

2.01 ± 0.02

2.19 ± 0.34

-

2.02 ± 0.02

2.01 ± 0.01

2.11 ± 0.18

4

0/5

0/5

0/5

1/5

0/5

1/5

2/5

4/5

 

-

0.50 ± 0.58

1.15 ± 0.29

2.02 ± 0.02

-

2.01 ± 0.01

2.00 ± 0.01*

2.97 ± 0.53*

  1. aNumber of positive/negative sows.
  2. bMean titers (log2) and standard deviation. Mean titers have been calculated as the arithmetic mean of positive sera only.
  3. cRepeated value of single positive sample.
  4. *Statistical difference (P < 0.05) for neutralizing activity against type 1 PRRSV and against type 2 PRRSV at the same days of gestation.
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Veterinary Research

ISSN: 1297-9716